Add function names to ColumnStatisticType

[ZacBlanco]

Description

This change adds function name parameters to the enum values of ColumnStatisticType. The function names are used when generating ColumnStatisticMetadata for the ANALYZE query.

This change is in preparation to allow connectors to override the function used to execute the statistics aggregations. Mainly it is to support connectors that have differing underlying histogram or NDV representations. For example, Hive natively generates KLL sketches from Apache Datasketches for histograms, Spark has it's own custom format. Some other connectors like mysql use a JSON format. Iceberg tables can store NDV estimates in Apache DataSketches Theta sketches. If we intend to support a variety of stats from other connectors this change is necessary.

Allowing the connector to override the function for each statistic type will let us generate statistic data in the format needed by the connector in order to store it in the connector-specific catalog metadata.

Motivation and Context

Eventual implementation of more column statistics

Impact

No user facing impact

Test Plan

No additional features need to be tested

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• PR description addresses the issue accurately and concisely. If the change is non-trivial, a GitHub Issue is referenced.
• Documented new properties (with its default value), SQL syntax, functions, or other functionality.
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• Adequate tests were added if applicable.
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Release Notes

== NO RELEASE NOTE ==

[ZacBlanco]

Closing this in lieu of #20993